[rules-users] Bad version number in class file

[Shigeaki Wakizaka]

Hi.

I just downloaded Drools 5.0.0.MR2 IDE from Drools site,
and i put the unzipped directory in my eclipse installed directory.

When I just create a Drools project,  "Bad version number in class file"
with Sample.drl file appears in the problem view.

What  should I do?

I'm using Ganymede , by the way.

Thanks in advance.

waki